The River Thames has been the heart of London life through the centuries. Discover London's medieval and maritime history with a walking tour in Greenwich, the birthplace of Kings and the maritime heart of the city, followed by a scenic Uber Boat ride up the Thames to the Tower of London.Your tour starts in Greenwich with a visit to the world-famous meridian line and to the Royal Observatory where you will see how the problem of latitude was tackled back in the 18th century, solving a great navigational question and propelling Britain's international trade and exploration.Then you will walk down through the famous sights of Greenwich such as its imposing old Royal Naval College (now the University of Greenwich), see the Queen's House, the Maritime Museum, and the Cutty Sark, and have lunch either from Cutty Sark or the surrounding restaurants.After lunch it's off to the river to sail back into the center of town, arriving at the iconic Tower Bridge and heading on to your final destination, the Tower of London. Built by William the Conqueror, the Tower was a dungeon and a fortress and is now home to the Crown Jewels.